feat: one Missing files page under Collection: folders gone, each with its album's want, last search or download, and Search, Releases and Remove; an album held before its files went is no longer shown as held again (M504 #5626)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/dbq/wanted.sql.go

@@ -1147,18 +1147,21 @@ SELECT w.id, w.release_group_mbid, w.artist_mbid, w.artist_name, w.title, w.reas
          ELSE                w.fulfilled_at IS NULL AND w.reason <> 'missing'
        END
    AND ($2::text = '' OR w.artist_mbid = $2::text)
-   AND ($3::text = ''
-        OR strpos(lower(w.artist_name), lower($3::text)) > 0
-        OR strpos(lower(w.title), lower($3::text)) > 0)
+   -- want_ids narrows to given wants: the Missing page's folders (M504).
+   AND (COALESCE(cardinality($3::uuid[]), 0) = 0 OR w.id = ANY($3::uuid[]))
+   AND ($4::text = ''
+        OR strpos(lower(w.artist_name), lower($4::text)) > 0
+        OR strpos(lower(w.title), lower($4::text)) > 0)
  ORDER BY lower(COALESCE(NULLIF(la.sort_name, ''), w.artist_name)), w.artist_mbid,
           NULLIF(COALESCE(NULLIF(w.first_release_date, ''), g.first_release_date, ''), '') NULLS LAST,
           lower(w.title), w.id
- LIMIT $5 OFFSET $4
+ LIMIT $6 OFFSET $5
 `
 
 type ListWantsParams struct {
 	State      string
 	ArtistMbid string
+	WantIds    []pgtype.UUID
 	Q          string
 	Skip       int32
 	MaxRows    int32
@@ -1204,7 +1207,8 @@ type ListWantsRow struct {
 }
 
 // The Wanted page: open wants (all but missing ones, or only missing ones),
-// the held ones, or all of them; artist_mbid narrows to one artist's page. Ordered like the library (#5572): artists A–Z by the
+// the held ones, or all of them; artist_mbid narrows to one artist's page,
+// want_ids to given wants. Ordered like the library (#5572): artists A–Z by the
 // library's sort name when it holds the artist, each artist's albums by
 // release date, so the page groups them as they arrive. q narrows to an
 // artist or album title; total counts every match, past the page.
@@ -1212,6 +1216,7 @@ func (q *Queries) ListWants(ctx context.Context, arg ListWantsParams) ([]ListWan
 	rows, err := q.db.Query(ctx, listWants,
 		arg.State,
 		arg.ArtistMbid,
+		arg.WantIds,
 		arg.Q,
 		arg.Skip,
 		arg.MaxRows,